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Old 06-19-2013, 02:48 PM   #1
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Plumbing check- Water Pump blew water

I need some help. I was checking some new plumbing that I installed, and when I connected the city water up to the moho - the water started pouring out what seems to be the bottom of the water pump.

The pressure from the city water hose was only 60psi. Did I blow the water pump? What is the right amount of pressure anyways?

If I did blow the pump, should I rebuild or buy a new one?
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Old 06-19-2013, 03:36 PM   #2
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something wrong in the setup. City water pressure should not get to the pump. There is supposed to be a check valve between the pump and the water system so that water can flow from the pump into the system but not back from the system into the pump.
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Old 06-19-2013, 03:49 PM   #3
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I was under the impression that the pump had a built in check valve. My original setup did not have a check valve between the pump and the water system.
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Old 06-21-2013, 09:38 AM   #4
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Originally Posted by Bill M. View Post
something wrong in the setup. City water pressure should not get to the pump. There is supposed to be a check valve between the pump and the water system so that water can flow from the pump into the system but not back from the system into the pump.
Do you think that maybe the check valve needs replacement? the diagram shows the check valve right before the Pressure Regulator, but I have not seen it.

I hope that is the problem.. the next question is - if the check valve didn't do its job, did I ruin the pump? I am going to change the pump anyways.. its 30 years old and bound to die sooner rather than later, and might as well change the check valve while I am at it.
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Old 06-21-2013, 10:08 AM   #5
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Do you think that maybe the check valve needs replacement? the diagram shows the check valve right before the Pressure Regulator, but I have not seen it.

I hope that is the problem.. the next question is - if the check valve didn't do its job, did I ruin the pump? I am going to change the pump anyways.. its 30 years old and bound to die sooner rather than later, and might as well change the check valve while I am at it.
If it's like a trailer, there are 2 check valves in the system. One is built into the pump, so that when you have city water it doesn't push through the pump and overflow your fresh water tank. The other is near the city water inlet, so that when the onboard pump is operating, you're not pumping your freshwater out through the city water inlet. That's the one that's indicated on a plumbing schematic, since the water pump's check valve is an integral part of the pump.
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Old 06-21-2013, 12:35 PM   #6
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Would it be overkill to add another Check Valve at the exit of the pump to have a back up in case of failure? Do Check Valves fail often?
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